Preparation of graphene via modified redox method and its electronic performance

Abstract

Graphene is considered to be the core material for the next Industrial Revolution. In this work, graphene oxide (GO) was prepared using a modified Hummers method and, then, reduced to obtain graphene. NH–RGO and VC–RGO were obtained by reducing GO under the same conditions by using hydrazine hydrate and vitamin C, respectively. X-ray diffraction (XRD) spectra were employed to characterize its crystal structure. A scanning electron microscope (SEM) was used to observe the microstructure. The defect degree was determined using Raman spectra. The resistivity of the nitrogen-doped graphene was determined using a four-probe method. The results showed that the preparation time was shorter when vitamin C was used for the GO reduction; further, both the required temperature and the environmental pollution were low in this case. The characteristic peaks of XRD were more obvious than those of NH–RGO and had fewer defects. Raman spectroscopy showed that the G-peak of the prepared VC–RGO was narrower and the D-peak was weaker. Further, the Raman spectroscopy ID/IG was smaller and the structural performance was better. The sheet resistivity of VC–RGO of approximately 0.0163 Ωm was slightly smaller than that of NH–RGO (0.0171 Ωm). Therefore, the proposed method is an ideal method for replacing hydrazine hydrate to produce graphene.

Keywords:

• Nitrogen-doped grapheme
• modified redox method
• VC–RGO
• electronic performance

Additional information

Funding

This work was jointly and financially supported by Core Teacher Training Plan for Young and Middle-aged Scientific Research of CDUT (Grant No. KYGG201708) and supported by Scientific Research Plan of Sichuan Provincial Department of Education (Grant No. 17ZB0055). This study was also supported by the Open Fund Project (Grant No. jr1603) supported by the Jiangsu Provincial Key Laboratory for Interventional Medical Devices.